Tuyere block



Jan. 29, 1935. IJ, H, HARLOW 1,989,514 v TUYRE BLOCK Filed Aug. 8, v1952 2 Sheets-Sheet 1 Arran/x HARLOW Jan. 29, 1935.

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Patented Jan. 29, 1935 The present invention-'relatesto tuyresvofffthe type' that are used in underfeedmechanicalstokers. The principal objects of the"v present `'inventionare' to cause airflow in a direction practically i. norma-l to the periphery ofthe tuyre-at all points of air emission, to effect efficient utilization of the space along the periphery ofthe tuyre, to provide-for a low, i. e.-, small pressure dropfthrough the tuyre, to provide" anefficient lcooling effect, to attain apractically uniform grading or fincrease 'ofl the air velocity from the nose'of the tuyre to the :sidesfof the tuyre, and to provide accuratedistriloutionof the air aro-und the tuyre.

Other objects ofthe invention will 'appear from the following description at the end of which the invention-'Will be claimed.

The invention also comprises the improvements to be presently described and finally claimed.

In the following description reference will be made to the accompanying drawings forming part hereof and in which,

Figure l is a top or plan View diagranirnatically illustrating a tuyre block.

Figure 2 is a bottom View drawn to an enlarged scale and showing so much of a tuyre block as is necessary for an understanding ofthe invention, and

Figure 3 is a view similar to Figure 2 illustrating a modification.

Referring to the drawings, and more particularly to Figure 2, the tuyre lolocli has approximately the exterior outline of an oblong horseshoe, with one end straight and the opposite end curved. 1 indicates a series of marginally disposed curved vanes. These vanes define between them curved air lanes 2 of progressively decreasing and increasing cross sectional area. The entrance portions of these air lanes are disposed substantially parallel to the longer axis a--a of the tuyre block and they (the entrance portions) are of progressively decreasing width from the straight end portion to the curved end portion of the tuyre block. This is indicated at 3 and 4. The exit portions 5 of the air lanes are substantially normal to the peripheral contour of the tuyre block and are of substantially the same cross sectional area. 6 indicates means by which the tuyre blocks may be mounted one upon another in the usual manner with the varies facing downward. The tuyeres are usually arranged bec tween the retorts of the underfeed Stoker mechanism.

The described shape of the air lanes turns the air stream approaching from the straight end portion or flat end of the tuyre to the side causing the airto leave the tuyre substantially norriial to the peripheryand this assists inlrnalcing niasimumfuse of vthel space providedrforair 'admission along the periphery off the tuyre: Y The vanes'fp'rovide the necessary cooling effect In 5 the described construction low resistance is 'effected because there 'are no pointsv wherethevair strikes against a barrier in such a vvay'as to cause a sudden'cha'nge oi" direction. r At'vthe same time the? air takes such al path'through the tuyrel v 'that itis forced intol intimate contactwith'lthe yvanes' `insuring goodcooling effect. In the performance" of l his result the Varying Widtl'i or crossfsecticnof V'the air lanes plays an important part .because the air' is forced to scour the surfaces of the vanesfopposi'ng the formationof hot air films. The gradual diminution in the width of the entrances of the air lanes toward the curved end portion of the tuyre block reduces the air velocity at thevcurved end portion of the tuyre block where the fuel bed is thinnest and also provides that most of the air is emitted from the sides of the tuyre where greater resistance to the air stream is provided by the fuel in the retorts. There are thus provided paths of equal resistance to the air atthe sides of the tuyre block and at the curved end portion of the tuyre block, because the fuel bed is thicker at the sides of the tuyre block than it is at the curved end portion of the tuyre block, and hence the air issuing at the sides of the tuyre .block must traverse a greater thickness of the fuel bed than must the air issuing at the curved end portion of the tuyre block. Providing air at high velocity on the sides and at low velocity at the curved end portion of the tuyre clock tends to burn coal in the retorts which is equivalent to increasing the effective burning area of the grate. Sufficient air is provided to cool the curved end portion of the tuyre and to provide for combustion of fuel at that point and at the same time most ofthe air is directed into the fuel in the retorts.

The construction and mode of operation of the modification illustrated in Figure 3 are as above described except that the vanes 1a are discontinuous and are provided with pointed ends and in this modification the air lanes 2a are of increasing and decreasing cross sectional area to the extentthat in some places they intercommunicate.

Itwill be obvious to those skilled in the art to which the invention relates that modifications may be made in details of construction and ar`- rangementand matters of mere form without de- 'parting from the spirit of the invention which vis not limited to such matters or otherwise than the prior art and the appended claims may require.

I claim:

l. A tuyre block having approximately the exterior outline of an oblong horseshoe, with one end straight and the opposite end curved, and having on one face a series of marginally disposed, curved .vanes projecting up from said face of the tuyre bloclg and dening between them curved air lanes, each of said air lanes being of progressively decreasing and increasing crosssectional area, the entrance portions ofrsaid air lanes being each disposed substantiallypar'allel to the longer axis of the tuyre block, said .entrance portions decreasing in succession progressively in the direction from the straight end toward the curved end of the tuyre block, and the exit portions of each of said air lanes being substantially normalv to the peripheral contour V2,. A tuyre block having approximately the exterior outline of an oblong horseshoe, with one end straight Aand the opposite end curved, a series of kmarginally disposed, interrupted, curved vanes projecting up from one of the faces of the tuyre block, said Vanes dening between them curved air lanes, said air lanes being each of progressively decreasing and increasing cross-sectional area, the entrance portions of said air laneskbeing each disposed substantially parallel to the longer axis of the tuyre block, said entrance portions decreasing in succession progressively in the direction from the straight end l :eral-contour of the tuyre block. .of the` tuyre block and each being of substan-f' tially-the same cross-sectional area.

toward the curved end of the tuyre block, and the exterior portions of said air lanes being each substantially normal to the peripheral contour of the tuyre block.

3. A tuyre block of approximately the exterior outline of an oblong horseshoe, with one end straight and the opposite end curved, a series of marginally disposed, interrupted, curved vanes projecting from one of the faces of the tuyre block, and having pointed ends and dening between them curved air lanes, said air lanes being each of progressively decreasing and increasing cross-sectional area, the entrance portionsof said air lanes being each disposed substantially parallel to the longer axis of the tuyre block, said entrance portions decreasing in succession progressively in the direction from the straight-end toward the curved end of the tuyre block, and the exit portions of said air lanes being each substantially normal to the periph- 4,A tuyre blockhaving approxirnatelyfthe exterioroutline of an oblong horseshoe, with one end straight and the opposite end curved, a series of marginallyudisposed, curved vanes projecting from one of the faces )of the tuyre block and defining between them curved air lanes, each of said air lanes being ofrprogressively decreasing and increasing lcross-sectional area, the entrance portions'of said air lanes beingeach substantially disposed parallel to the longer axis of the tuyre block, and the exit portions of each of said air lanes being substantially normal to the peripheral contour of the tuyre block. i 

